Venezuela's Hugo Chávez and Cuba's Raúl Castro – two presidents who need each other but for different reasons – signed a series of bilateral accords here Saturday in a visit heavy with symbolism because it marked the first trip abroad by Mr. Castro since he succeeded his ailing brother Fidel.

"We give a fervent welcome to you as one of the forces behind the [Cuban] Revolution," Mr. Chávez said, as he greeted Raúl Castro with a hug at the international airport outside Caracas. "It's a great honor for us to receive you."

"I bring a salute, a hug for all Venezuelans from the Cuban people and from the leader of the revolution, Fidel Castro," Raúl Castro replied.

Speaking to reporters a few minutes later, Castro remarked that he had last visited Venezuela 55 years ago, when he was a student conspiring with his older brother to overthrow Cuba's dictatorship.

Raúl Castro said he offered his respects then to Simon Bolivar, the Venezuelan who played a decisive role in freeing South America from colonial Spain nearly 200 years ago. Chávez constantly cites Bolivar as a role model.

So it was not surprising that the two presidents laid a wreath at a statue of Bolivar in downtown Caracas in the morning and at Bolivar's tomb in the afternoon.

Cuba depends on Venezuelan oil

For Raúl Castro, the trip was important for more than just the symbolism: Cuba's economy depends on Venezuelan oil that Chávez is believed to provide free of charge.

For Chávez, the trip was important for its imagery: it reinforced his ties to the Cuban Revolution and Fidel Castro that serve as the guiding stars in his efforts to forge an anti-US and anti-capitalist alliance throughout Latin America.

Outside commentators have speculated that Chávez has been unable to establish with Raúl Castro anything near the warm and indeed fatherly relationship that he has enjoyed with Fidel Castro, who relinquished power in July 2006.

To perhaps show otherwise Saturday, Chávez hugged Raúl Castro upon his arrival and draped his arm around him repeatedly as if they were best friends.

But Daniel Erikson, a senior fellow at the Inter-American Dialogue and author of the recently published book "The Cuba Wars" said that the question of personal chemistry between Chávez and Raúl Castro takes a back seat to their mutual needs.

Besides wanting to link himself to Cuba and the Castros, Chávez benefits from the thousands of doctors, nurses, sports coaches, and agricultural specialists who serve Venezuela's poor, Erikson said.

Jorge Piñón, a Cuban native who is the energy fellow at the University of Miami's Center for Hemispheric Policy, said the 94,000 to 96,000 barrels per day of crude oil, diesel, and jet fuel that Venezuela sends to Cuba amount to two-thirds of the petroleum products that the island nation consumes. It will be worth at least $3 billion in 2008, Piñón said.

"If Chávez gets hit by a truck tomorrow, Cuba is in big trouble," he said.

A "Plan B" that didn't involve Venezuela would be devastating to Chávez, who has cast himself as the political heir of Fidel Castro. Chávez travels frequently to Cuba to visit the ailing former leader and typically calls out "How are you, Fidel"? in English on his Sunday nationwide chats.

Raúl Castro suggested in remarks last month that Chávez pressured him to visit Venezuela before he went to Brazil.

For his part, Chávez had emphasized in recent days that Fidel Castro also made his first foreign trip abroad to Venezuela after assuming power, nearly 50 years ago, immediately after the Cuban Revolution triumphed.

Oil played a key role on that trip, too, but behind the scenes.

Some 20,000 delirious Venezuelans greeted Fidel Castro at the airport and thousands more turned out for a massive rally in downtown Caracas.

But Mr. Betancourt disclosed later that Castro asked him for a $300 million loan to help Cuba end its dependence on the United States, wrote Robert Quirk in his 1993 biography, "Fidel Castro." Venezuela could make the payment in oil, Castro suggested.

Betancourt rebuffed him. Castro retaliated by sponsoring a guerrilla movement in Venezuela that attempted but failed to topple Venezuela's democracy.